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Severe biological effects under present-day estuarine acidification in the seasonally variable Salish Sea

Highlights • Spatial and temporal variation in estuarine acidification cause severe biological responses. • Extreme low saturation state and duration of exposure cause pteropod shell dissolution. • Changing estuarine conditions cause cumulative stress that was used to generate stress index. • Compensatory mechanisms allow pelagic calcifiers to persist in extreme

An integrated field-laboratory investigation of the effects of low oxygen and pH on North Pacific krill (Euphausia pacifica)

Krill are abundant and ecologically important zooplankton that inhabit dynamic environments characterized by strong natural variability, but global ocean change is shifting the range of conditions that they experience. Laboratory tests reveal that krill are sensitive to ocean acidification despite residing in naturally low pH areas, showing the importance of

Pteropods make thinner shells in the upwelling region of the California Current ecosystem

Shelled pteropods are widely regarded as bioindicators for ocean acidification, because their fragile aragonite shells are susceptible to increasing ocean acidity. While short-term incubations have demonstrated that pteropod calcification is negatively impacted by ocean acidification, we know little about net calcification in response to varying ocean conditions in natural populations.